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Compared to z/OS, the z/VSE operating system provides a
smaller, less complex base for batch processing and transaction processing. The
design and management structure of z/VSE is excellent for running routine
production workloads consisting of multiple batch jobs (running in parallel)
and extensive, traditional transaction processing. In practice, most z/VSE
users also have the z/VM operating system and use this as a general terminal
interface for z/VSE application development and system management.
z/VSE was originally known as Disk Operating System (DOS),
and was the first disk-based operating system introduced for the System/360
mainframe computers. DOS was seen as a temporary measure until OS/360 would be
ready. However, some mainframe customers liked its simplicity (and small size)
and decided to remain with it after OS/360 became available. DOS became known
as DOS/VS (when it started using virtual storage), then VSE/SP and later
VSE/ESA™, and most recently z/VSE. The name VSE is often used collectively
to refer to any of the more recent versions.
http://www.redbooks.ibm.com/redbooks/pdfs/sg246366.pdf
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